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Thread: Idle flare going from gear to P/N

  1. #1
    Advanced Tuner WS6HUMMER's Avatar
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    Idle flare going from gear to P/N

    Tuning a freshly cammed 98 f-body and having a time idlling. It flares up when going from in gear to park or neutral. It's also going on cruise @ 2k. When I got the car you had to keep your foot on the gas just to keep it running so its came a long way but I'm just trying to work out the bugs before I get started VE tuning. The cam is a TSP 233/239 618/623 on a 112+2 Any ideas?
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    99 T/A WS6, original LS1 turbo

  2. #2
    Advanced Tuner WS6HUMMER's Avatar
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    New tune, a little better.
    99 T/A WS6, original LS1 turbo

  3. #3
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    Two things to start. Timing between Idle and Cruise tables needs to be blended. There is way to large of a gap there and its going to make things very jumpy. With idle timing blended to regular tables, run Russ K's Idle Airflow again and try it out. Unless you've got a converter that is not set for that cam your tuning, timing and airflow tables should fix most of this. Is there a reason your Primary VE values haven't been transferred to the Secondary???
    Last edited by MMGT1; 02-23-2015 at 12:11 PM.
    2000 Trans Am WS6

  4. #4
    Advanced Tuner WS6HUMMER's Avatar
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    Quote Originally Posted by MMGT1 View Post
    Two things to start. Timing between Idle and Cruise tables needs to be blended. There is way to large of a gap there and its going to make things very jumpy. With idle timing blended to regular tables, run Russ K's Idle Airflow again and try it out. Unless you've got a converter that is not set for that cam your tuning, timing and airflow tables should fix most of this. Is there a reason your Primary VE values haven't been transferred to the Secondary???
    Thanks, I'm sure that will help. I've been having a hard time to get this car to smooth out but happy with no learning that after the owner drove it 5 hrs away to work that the whole time it had an intermittent bad TPS. The car has a 639" lift cam and a bone stock converter so I'm sure that has a lot to do with the issue I'm having too.
    99 T/A WS6, original LS1 turbo

  5. #5
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    Get a stall asap, your going to have nothing but trouble. Lots of choices out there but I'd shoot Chris at Circle D a email and give him your mod list. He'll set you up right
    2000 Trans Am WS6

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    After doing some idle tuning on a '98 with a 227/234 .614/.612 LSL/LXL 110 +2 and a 7.25" race clutch I'm sure with a stock stall you'll have a lot of issues. A few things did occur to me though looking at your tune:

    In the Idle - Airflow tab:

    Throttle follower decay - we had to increase these numbers more than you have to get rid of the cruse control.
    Throttle follower delay - why do you want to increase the delay before the decay starts at higher mph? We decreased ours (M6 may be different than an auto)

    Throttle cracker - we also reduced these more than you have.


    In Spark - Advance

    Overspeed - We cut these values in half and that helped a ton with idle stability
    Underspeed - Same as above

    Hope that helps. We had a hell of a time with ours....

    Jason

  7. #7
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    With a stock stall what you have to do to the RAF when a cam is involved makes things very hard. It will shift hard into drive from neutral or park after running the idle trim config for tuning(Russ's). I reduced shift time at reported Tq for idle to help it a bit. It works but its not right, need a stall asap myself. Must be a terrible bog your dealing with as well off the line. Ive done a small cam and the stock stall is making me crazy.
    2000 Trans Am WS6

  8. #8
    Advanced Tuner WS6HUMMER's Avatar
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    Quote Originally Posted by MMGT1 View Post
    With a stock stall what you have to do to the RAF when a cam is involved makes things very hard. It will shift hard into drive from neutral or park after running the idle trim config for tuning(Russ's). I reduced shift time at reported Tq for idle to help it a bit. It works but its not right, need a stall asap myself. Must be a terrible bog your dealing with as well off the line. Ive done a small cam and the stock stall is making me crazy.
    No bog at all, this thing screams, its just that dang flare when going from gear to P or N.
    99 T/A WS6, original LS1 turbo